'''
Core Abstraction
================
This module defines the abstraction layers for our core providers and their
implementations. For further information, please refer to
:ref:`architecture` and the :ref:`providers` section of the documentation.
In most cases, you shouldn't directly use a library that's already covered
by the core abstraction. Always try to use our providers first.
In case we are missing a feature or method, please let us know by
opening a new Bug report instead of relying on your library.
.. warning::
These are **not** widgets! These are just abstractions of the respective
functionality. For example, you cannot add a core image to your window.
You have to use the image **widget** class instead. If you're really
looking for widgets, please refer to :mod:`kivy.uix` instead.
'''
import os
import sys
import traceback
import kivy
from kivy.logger import Logger
[docs]class CoreCriticalException(Exception):
pass
def core_select_lib(category, llist, create_instance=False,
base='kivy.core', basemodule=None):
if 'KIVY_DOC' in os.environ:
return
category = category.lower()
basemodule = basemodule or category
libs_ignored = []
errs = []
for option, modulename, classname in llist:
try:
# module activated in config ?
try:
if option not in kivy.kivy_options[category]:
libs_ignored.append(modulename)
Logger.debug(
'{0}: Provider <{1}> ignored by config'.format(
category.capitalize(), option))
continue
except KeyError:
pass
# import module
mod = __import__(name='{2}.{0}.{1}'.format(
basemodule, modulename, base),
globals=globals(),
locals=locals(),
fromlist=[modulename], level=0)
cls = mod.__getattribute__(classname)
# ok !
Logger.info('{0}: Provider: {1}{2}'.format(
category.capitalize(), option,
'({0} ignored)'.format(libs_ignored) if libs_ignored else ''))
if create_instance:
cls = cls()
return cls
except ImportError as e:
errs.append((option, e, sys.exc_info()[2]))
libs_ignored.append(modulename)
Logger.debug('{0}: Ignored <{1}> (import error)'.format(
category.capitalize(), option))
Logger.trace('', exc_info=e)
except CoreCriticalException as e:
errs.append((option, e, sys.exc_info()[2]))
Logger.error('{0}: Unable to use {1}'.format(
category.capitalize(), option))
Logger.error(
'{0}: The module raised an important error: {1!r}'.format(
category.capitalize(), e.message))
raise
except Exception as e:
errs.append((option, e, sys.exc_info()[2]))
libs_ignored.append(modulename)
Logger.trace('{0}: Unable to use {1}'.format(
category.capitalize(), option, category))
Logger.trace('', exc_info=e)
err = '\n'.join(['{} - {}: {}\n{}'.format(opt, e.__class__.__name__, e,
''.join(traceback.format_tb(tb))) for opt, e, tb in errs])
Logger.critical(
'{0}: Unable to find any valuable {0} provider.\n{1}'.format(
category.capitalize(), err))
def core_register_libs(category, libs, base='kivy.core'):
if 'KIVY_DOC' in os.environ:
return
category = category.lower()
kivy_options = kivy.kivy_options[category]
libs_loadable = {}
libs_ignored = []
for option, lib in libs:
# module activated in config ?
if option not in kivy_options:
Logger.debug('{0}: option <{1}> ignored by config'.format(
category.capitalize(), option))
libs_ignored.append(lib)
continue
libs_loadable[option] = lib
libs_loaded = []
for item in kivy_options:
try:
# import module
try:
lib = libs_loadable[item]
except KeyError:
continue
__import__(name='{2}.{0}.{1}'.format(category, lib, base),
globals=globals(),
locals=locals(),
fromlist=[lib],
level=0)
libs_loaded.append(lib)
except Exception as e:
Logger.trace('{0}: Unable to use <{1}> as loader!'.format(
category.capitalize(), option))
Logger.trace('', exc_info=e)
libs_ignored.append(lib)
Logger.info('{0}: Providers: {1} {2}'.format(
category.capitalize(),
', '.join(libs_loaded),
'({0} ignored)'.format(
', '.join(libs_ignored)) if libs_ignored else ''))
return libs_loaded
